Typewriting machine



Aug. 31, 1943. w. A. DOBSON TYPEWRITING MACHINE Filed Dec. 31, 1940 8Sheets-Sheet l Mil/4 I9- 00650 BY K& s z 4 ATTOIZN EY Aug. 31, 1943. w.A. DOBSON TYPEWRITING MACHINE Filed Dec. 51, 1940 '8 Sheets-Sheet 2 Him.

- INVENTOR Mill/74f I? 00850 ATTORNEY Aug. 31, 1943. w. A. DOBSONTYPEWRITING MACHINE Filed Dec. 51, 1940 s Sheets-Sheet s INVENTOIZnon/,4 4. 008504" BY y a ATTORNEY Aug. 31, 1943. w. A. DOBSONTYPEWRITING MACHINE 8 Sheets-Sheet 4 -INVENTOR W/ZZ/fil/ 5 00 550ATTORNEY Filed Dec. 51, 1940 Aug. 31, 1943. w. A. DOBSON TYPEWRITINGMACHINE Filed Dec. 51, 1940 8 Sheets-Sheet 5 Aug. 31, 1943.

w. A. Do'ssoN 2,328,375

TYPEWRITING MACHINE Filed Dec. 31, 1940 8 Sheets-Sheet 7 mannunmn nnnnIIIIIIIIIUL l l l l F M E INVENTOR W/Z 1/19 a 00550 ATTO R N EY PatentedAug. 31, 1943 TYPEWRITING MACHINE William A. Dobson, Wethersfield,Conn., assignor to Underwood Elliott Fisher Company, New

York, N. Y., a corporation of Delaware Application December 31, 1940,Serial No. 372,622

10 Claims.

This invention relates to carriage stop mechanisms for typewritingmachines and has reference more particularly to combined margin andtabulating mechanisms including key-settable stops.

Typewriting machines equipped for both margin gaging and tabulatingusually include separate mechanisms for each of these functions and havea set of margin'stops and a separate array of tabulator stops. Toprovide for key setting of both the margin and tabulator stops, aseparate set of letter-spaced stops is usually required for I eachfunction, and inaddition, two stop-setting mechanisms each operable byits own key are re quired. In some key-set margin stop mechanisms,different stops are required for left margin regulating than those forregulating the right margin, and further, individual counterstops foreither left or right margin control are deemed necessary, in order thatlocking of the machine at the typed line end is had. Separate stoparrays on the carriage for margin gaging and tabulating, difierentmargin stops for either right or leftmargin, individual counterstops foreach margin, and separate mechanisms for. setting the stops of eacharray, all contribute materially to the increased cost of producing andmaintaining I typewriting machines of this character.

One of the objects of the present invention is to provide a combinedmargin and tabulator mechanism having provision for key-setting andrestoring of a the stops, which is particularly adapted for economicalmanufacture, comprises a minimum number of simple parts, and is reliablyoperative in extended service.

Another object of the invention is to provide a-key-settable margin andtabulator mechanism in which only a single series of letter-spacecarriage stops is employed and in which the stops are identicalthroughout the entire series and may be set to function either in gagingthe margins of typed matter, or as column-defining or tabulator stops.

A further object is to provide a margin andtabulator mechanism in whichall the elements directly cooperative with the letter-spaced carriagestops. are arranged in a closely organized, compact group so that eachof the elements, in-

cluding the stop restorer, the margin counter-.

stop; the tabulator counterstop and other related elements, areoperative at a single step,

setting station.

, Other objects will hereinafter appear. i

In the embodiment of the invention illustrated,

a series of stops are arranged atletter-space intervals on the carriageandare settable individually by a single, differently operable key toeither of two efiective positions, in one of which the stop serves inmargin gaging and in the other as a tabulator stop. A normally raisedmargin counterstop is disposed in the path of the set margin stops andclear of the set tabulator stops. De

vices associated with the margin counterstop cause the latter to bemomentarily lowered as a stop is set for margin gaging, the devicesoperating to hold the counterstop depressed until after the set marginstop is moved in carriage travel, either to the left or right of thecounterstop, thus determining whether the set stops operate in left orright margin-gaging. This mechanism for effecting right and leftmargin-stop selection is made the subject matter of my copendingapplication Serial No. 376,045, filed January 2'7, 1941. Depression of atabulator key institutes a carriage run and raises a tabulatorcounterstop to carriage-stop-intercepting position, thereby arrestingthe carriage at each tabulator station. Provision is made for typingbeyond either margin as determined by a set margin stop. Upon same torelease the depressed margin counterstop. This margin-release mechanismforms the subject matter of my copending application Serial No. 376,046,filed January 27, 1941. A stop.

restoring mechanism includes a single stop-restorer element adapted torestore all of the set tabulator stops during a carriage run,-withoutdisturbing the set margin stops and is further adapted to individuallyrestore any set stop whether for margin gaging or tabulating, afterbanking the carriage at the stop to be restored. Other mechanismsproviding a line-end signal and line lock are also'associated with thecombined margin gaging and tabulating mechanism of the invention.

In the drawings:

Figure l is a perspective view illustrating the combined margin-gagingand tabulatormechanism of the invention.

Figure 2 is a view similar to Figure 1 butillustrating only that portionof the mechanism including mainly the counterstops, stop restorer andstop setter.

Figure 3 is a transverse sectional view through the mechanism shown inFigure 1, taken on a fore-and-aft plane' of the typewriter.

Figure 4 is an enlarged front elevation of the margin-gaging mechanism,omitting other associated mechanisms to facilitate illustration.

Figure 5 is a transverse sectional view of the margin-gaging mechanism,taken on a line 5-5 of Figure 4.

Figure 6 is an enlarged front elevational view of the tabulatormechanism, showing also the stop setter and restorer elements, withassociated mechanisms omitted to facilitate illustration.

Figure 7 is a transverse sectional view through the tabulatormechanism;taken on the staggered line 1-1 of Figure 6, but omitting thestop setter.

Figure 8 is a fragmentary elevational view illustrating the stop-settingmechanism in operation to set a margin-gaging stop.

Figure 9 is a fragmentary elevational view illustrating the stop-settingmechanism operated to set a stop for tabulating.

Figures 10 and 11 are views supplementing Figure 8, showing the twopositions of a, set stop relatively to the margin counterstop uponmovement of the carriage in each direction, subsequent to stop setting.

Figures 12 and 13 are elevational views relating respectively to Figures10 and 11 and illustrating the coaction of the right and leftmargingaging stops with the margin counterstop in each direction ofcarriage movement.

Figure 14 illustrates the operation of the stoprestoring mechanism torestore a series of stops set for tabulating, during a carriage run.

Figures 15 and 16 supplement Figure 14. Figure 15 shows a margin-gagingstop abutting the stop restorer without disturbing the former, during acarriage run to restore the tablulator stops, and Figure 16 shows thestop restorer in readiness to restore a margin-gaging stop.

Figures 17 and 18 are similar views illustrating the margin-releasemechanism operated to allow for typing beyond a margin and show, in rFigure 17, the mechanism in initially operated position after depressingthe margin release key, and in Figure 18, the final position of themechanism after release of said key.

Figure 19 shows the margin-release mechanism in the initial stage ofrestoring the counterstop for its normal margin-gaging function, aftertyping beyond the right margin.

Figure 20 is a view similar to Figure 19 but illustrating the initialstage of restoring the counterstop after typing beyond the left margin.

Figure 21 illustrates the tabulator mechanism operated to institute acarriage run, with a set tabulator stop approaching engagement with theraised tabul or counterstop.

Figure 22 is a plan view of the letter-feed escapement mechanism, alsoshowing portions of the mechanisms for line locking and carriagerelease, and.

Figure 23 is a. fragmentary front elevation of the escapement mechanism.

Referring now more particularly to Figure 3 of the drawings, a carriage10 includes spaced end members I I that are rigidly connected by acarriage bar l2. A platen cylinder I 3 extends parallel to the carriagebar l2 and is rotatably mounted in the end members H. The carriage isguided for line typing and return movement on trackways H supported onthe main frame 15 of the machine. A spring drum l6 moves the carriage inletter-feed direction under control of a. letter-feed escapementmechanism I1 which includes a. rocker l8 carrying dogs which cooperatwith an escapement wheel l9. The escapement mechanism is carried on abracket plate 20 extending across the machine and supported on the mainframe 15 thereof. The escapement wheel I3 is geared to a rack 2| on thecarriage by a. pinion 2|. The typing instrumentalities may be of anyknown kind and may in clude type bars 23 that are movable against theplaten I3 by type keys in the usual manner. The escapement is operatedby engagement of the type bars 23 with a universal bar 24 to rock thedog rocker l8 on its pivot 22 at the actuation of the type keys, in thewell-known manner. In consequence of each type key operation, thecarriage is advanced step by step at letter spaces to type thecharacters along a typing line.

Carriage stop back The stop rack organization illustrated forms thesubject matter of my copending application Serial No. 369,467, filedDecember 10, 1940. Briefly, this organization includes a series ofletter-spaced, key-settable stops 25 slidably supported on a rack bar 26mounted on the carriage end members II. A detent spring 21 extendingalong the rack bar, coacts with each of the stops to yieldably hold thesame at retracted, ineffective position, or at either of two effectivepositions, each stop having a series of detent notches defining saidpositions.

The lower end of each stop 25 presents two laterally related tabs 28, 29offset vertically from each other. As shown more clearly in Figure 1,these tabs are each adapted to engage with certain counterstops when setto certain positions. When a stop 25 is lowered the full extent or twonotches, the stop is set for margin gaging, the tab 23 being disposed toengage a margin counterstop 30 during carriage travel. When the stop 25is lowered half way or one notch, it is set to define a tabulatorstation, the tab 28 thereof being adapted to engage a tabulatorcounterstop 3| when the latter is raised from ineffective positionduring a tabulating operation. It will be noted, however, that the stopsset for tabulating, being lowered only half way, pass clear of themargin counterstop 30. The vertically off-set relation of the two tabs28, 29 is preferred in order that a set margin stop may have the tab 29project only a minimum from the rack bar.

Stop setting The stop-setting mechanism, shown more clearly in Figures1, 2, 8 and 9, includes a stop setter 33 mounted for vertical movementand carrying a finger 34 at its upper end, arranged to overlie theseries of stops 25, this finger being adapted to engage any one of saidstops positioned thereat in accordance with the position of the carriageat the moment of stop setting. The lower end of the stop setter 33 isflexibly connected to an arm 35 fixed on a rock shaft 36 journaled ateach end and at the middle in brackets 3'! of a back plate 38 which mayform part of the main frame of the typewriter. The shaft 33 extendsacross the machine to provide pivotal support for certain elementshereinafter described. A lever arm 40, secured to said shaft, isconnected by a link 4| setting lever 42 pivoted at 45, a second arm 44of which projects forwardly to the keyboard of the machine.

A spring 45; acting on the stop setter 33, yieldably holds the settingmechanism in normal, inactive position at which the lever 42 engages afixed member 46 on the machine frame, see Fig-'- ures 8 and 9. Astop-setting key 41 is carried on a stem 48 pivotedat 49 on the leverarm 44 adjacent the forward end thereof. The key stem to one arm of astop- 48 projects downwardly and provides a gaging stop 50 at its lowerend adapted to engage a fixed member 5| of the machine frame. stem 48includes two laterally projecting lugs 52, 53 on opposite sides of thestem pivot 49 and.

The key adapted to engage different portions of the lever arm 44. Aspring 54, connected between the stem 48 and arm 44, yieldably holds thekey stem in normal; upright position defined by the engagement of lug 52with the arm 44. In-said position, the gaging stop 50 comes intoengagement with the member 5| when the stop-setting key 41 is presseddirectly downward. By such operation, the stop setter is drawndownwardly only half of its full extent of movement, thereby setting thestop 25 for tabulating, all as shown in Figure 9. To set a stop 25 formargin gaging, the key 41 is pressed downwardly and also urged forwardlyagainst the tension of spring 54 until lug 53 engages the lever arm 44thereby moving the gaging stop 50 to a position clear of the member 5|.By operating the stop-setting key 41 in this manner, as illustrated inFigure 8, the stop setter 33 is lowered to the full extent determined byengagement of lever arm 44 with the member 5| and thus moves a stop 25 acorresponding degree, setting same for margin gaging.

Stop restoring The stop-restoring mechanism, shown best in Figures 1, 2,6, and '1, includes a stop restorer 51 guided for up-and-down movementon the plate 38 by a stud-and-slot mounting 58. The restorer 51 has apin-and-slot connection adjacent its lower end to an arm 60 of arockable member 6| pivotally carried on the shaft 36 and including asecond arm 62 connected by a link 63 to a stoprestorer button 64. Thebutton 64 is slidable in an aperture of a front plate 65 of the machineand includes a shoulder 66 abutting the back of said plate. A spring 61,acting on the rockable member 6|, restores the mechanism to normalposition, with the stop-restorer 51 retracted. The upper end of the stoprestorer 51 carries a projecting portion 68 presenting an inclined face69 and a horizontal face 10, the face 69 rising in carriage-returndirection.

The operation of the stop-restoring mechanism to restore any settabulating or margin-gaging into its ineffective position on the stoprack. It

is preferred to restore only the tabulator stops by such operation andto leave the margin-gaging stops in set position, in that it is usuallydesirable to maintain the selected position of the margin stopsthroughout the work at hand. The stoprestorer projection, therefore, isso arranged that 'a margin-gaging stop abuts a vertical face of theprojection and leaves said stopundisturbed, as

in Figure 16, and, by pressing the. restorer button 64, the face I0 isbrought against the bottom edge of the stop, raising same to ineffectiveposition in the rack.

M drain-stop selection Any stop set for margin-gaging may functioneither as a left-hand stop to determine the beginning-of-line position,or as a right-hand stop to determine the line-end position of thecarriage. the direction of carriage movement following the margin stopsetting operation.

In other words, after setting any one of the stops 25 for margin'gaging,the carriage may be moved to the left, putting the set stop at the leftof the margin counterstop 30, so that said stop will thereafterdetermine the beginningof-line position of the carriage. Inversely, whenthe carriage is moved to the right after stop setting, the set stop ispositioned on the right side of the counterstop 30 for determining thelineend position of the carriage. As shown more clearly in Figures 2, 4,and 5, the margin coun terstop 30is mounted for up-and-down and lateralmovement. A slot 12 adjacent the lower end of the counterstop rides on astud 13 carried on the bracket plate 38. A spring 14 yieldably holds thecounterstop in normal, raised position, determined by engagement of theend of slot 12 with the stud 13. In said raised position, a projection15 on the counterstop 30 is in the path of the margin-set stops tointercept the tabs, 29 thereof. The counterstop may oscillate about thestud 13 laterally, that is, in the plane of carriage movement, betweencertain limits which determine two effective positions of thecounterstop illustrated respectively in Figures 12 and 13. A yoke-likebracket 16, secured at each end to the plate 38, straddles thecounterstop 30 and other elements associated therewith, and has twobent-01f lugs 11, 18 adapted to be engaged by the sides of thecounterstop 30 when the latter is swung to either of said positions. Thespring 14, acting on an off-set arm 19 of the counterstop 30, exerts itsforce in such direction as to hold the counterstop in normal, uprightposition against the lug 11, see Figure 13, in which position thecounterstop remains when arresting the carriage in rightward travel, atthe beginning of a typing line. In arresting the carriage in line-endposition, the margin-gaging stop, being intercepted by the counterstop30, causes the counterstop to swing aganist the lug 18. This swingingmovement is employed to operate a linelock device, hereinafterdescribed, but is primarily intended to assure a corresponding positionof the margin-gaging stop 25, whether functioning for left or rightmargin gaging. In other words, the right-hand margin stop 25, Figure 12,and the left-hand margin stop, Figure 8, assume corresponding positionslaterally of the machine when the carriage is arrested at either margin.

This stop selection is accomplished by I It will be observed by acomparison of Figure 13 and 8 that, in its actual typing position,Figure 8, the carriage has dropped back a fractional letter space fromthe position of stop interception, Figure 13. This drop-back is usual inmargin-stop mechanisms, being required to allow the letter-feedmechanism to assume control of the carriage after the carriage stop hasengaged the counterstop. The counterstop projection I may be of anarbitrary width but is preferably thin to minimize the extent ofrequired movement of the counterstop. Determination of the extent ofthis lateral movement takes into account the actual thickness of a stop25 and the counterstop, making allowance for the mentioned dropback ofthe carriage, and is adequate to arrest the carriage with the right-handstop at the same position taken by the left-hand stop after theletter-feed mechanism has assumed control of the carriage, as shown inFigure 8. This position, hereinafter referred to as the "stop station,is that at which the stop-setting finger 34 and the stop restorer face10 are also disposed, so as to set or restore any stop brought to thatstation by carriage movement.

As aforeindicated, mean is provided by which a set margin stop mayassume its effective position at either side of the margin counterstop30. A buttress 80 is pivotally mounted on the counterstop and isarranged to overlap the projection thereof and extend to the left beyondsaid projection into the mentioned stop station," with the counterstopin its normal position, see Figure 4. The top edge of the buttress isarcuate on a radius from its pivot center so as to clear the stop rackbar 26 in all angular positions and is positioned just above the top ofthe counterstop projection 15. The buttress 80 is yieldably held innormal position by a spring 8| interposed between a lower arm of thebuttress and the counterstop, at which position, a lug 82 on thebuttress engages an inner edge of the counterstop.

The function and operation of the buttress 80 in setting the stops formargin gaging is illustrated in Figures 8, 10 and 11. At the moment ofsetting a stop, the margin counterstop 30 is in its normal, rightwardposition, and the buttress is in its normal, leftward position,projecting into the stop station. As the stop-setting mechanism isoperated, as shown in Figure 8, to set a stop for margin gaging, thestop being lowered engages the buttress 80 and the counterstop 30 isthus retracted to the position shown in full line, against the tensionof spring 14. If the set stop is intended for right-hand margin gaging,the carriage is moved to the right and the set stop, riding along thetop edge of the buttress or swinging the buttress with it, travels tothe right side of the projection 15, in which position the counterstopis released to assume its normal position under influence of spring 14.When it is intended that the set stop function to gage the left margin,the carriage is moved to the left after setting the stop, and thecounterstop is thus released to normal position with the stop to theleft of the projection '15. The buttress 80 is pivotally mounted inorder that same may swing out of the way when the mechanism functions togage a left-hand margin, see Figure 13, so that the left-hand stop maydirectly engage the margin-counterstop. For right-hand margin gaging,the buttress remains in normal position, while the margin counterstop30, carrying the buttress with it, swings to the position shown inFigure 12. By this procedure, a stop 25" is set for margin gagingadjacent each endof the carriage and defines a line-typing zone betweenthese stops, into which zone the counterstop projects for interceptionOft'he'marg'in-gaging stops 25' moving with the carriage in eitherdirection.

Line-end signal The mechanism for signalling the approach of a typingline end is shown in Figure 4. A lever 84 pivoted on a stud 85 carries ahammer 88 adapted to strike a bell 81. An arm of the lever pivotallycarries a tripper dog 88 weighted to normally rest against a stop 89with its upper portion projecting into the path of the margin stops 25 Aspring 99 urges the lever to the bell-striking position shown, at which9. lug 91 engages the plate 38. The dog 88 is positioned a suitablenumber of letter spaces ahead of the counterstop 30, and, as theright-hand stop 25 moves leftward in line typing, it engages theinclined face of the dog 88, raising the hammer 86 and then releasingsame to strike the bell under influence of spring 90. During carriagereturn, the dog 88 is swung clockwise by the passing margin stop 25"while the lever 84 remains inactive.

Line, locking The mechanism for locking the machine at the end of atyped line is shown best in Figures 3, 4 and 22. As previouslydescribed, the counterstop 38 is swung to the position shown in Figure12 when the carriage is arrested at the typing line end, which movementoperates the line-lock mechanism. A lever 93, Figure 3, is pivoted at 94on the bracket plate 20 and has a yieldable end portion or spring 95engaging the left side of the counterstop 39, see Figure 22. Lever 93reaches through an aperture in the plate 28 and carries. a lug 96.During line typing, the dog rocker I8 is oscillated on its pivot 22 forthe letter-feed control of the carriage. The counterstop 38, being inits normal, upright position, Figure 13, leaves the lever 93 in normal,ineffective position at which lug 96 is free of the dog rocker I8, thelever 93 being restored to normal position by a spring 91. As thecounterstop 30 is swung to the Figure 12 position, lever 93 is actuatedand the lug 96 thereof is brought to position to obstruct the dogrocker, thereby holding the universal bar 24 immovable, preventing thetype bars 23 from completing a typing stroke.

Margin release When it is desired to type beyond either margin, amargin-release button 98 is depressed, which retracts the margincounterstop 30 from the path of the margin stop 25 to permit passage ofthe latter to the opposite side of the counterstop. As shown in Figures1 and 3, a

- push rod 99 issuing from the release button 98 is flexibly connectedto an arm I80 of a rockable member l0l rotatably mounted by trunnionsjournaled on the main frame and a bracket 1 hanging from the plate 20,Figure 3. A second resilient latch member I06, preferably in the form ofa-flat spring, is mounted for pivotal and endwise movement by a headedstud I06 secured to the latch member and engaged in a vertically'elongate slot I01 in the bracket 16. A tension spring I08 yieldablyholds the latch member down,'with the stud I06 bottoming in the slot.

The spring I08 is arranged to exert its force on the latch I in asubstantially perpendicular line from the center of stud I06 so as toyieldably hold the latch in a normally upright position, see Figure 4.The lower end of the latch I05 is bent at an angle inclining toward thecounterstop 30 to provide a bevel I09. As the counterstop is retracted,a catch IIO thereon, Figure 5, cooperatmg with the bevel I09, flexes thelatch I05 out- 1 wardly until the catch H0 is engaged under the bottomend of the latch. This condition of the mechanism is illustrated inFigure 17 and is a result of pressing the release button 98, beforereleasing same, and may follow from either condition of the stopmechanism shown in Figures 12 and 13. From the Figure 13 position, thecounterstop 30 is merely retracted until latched down, without varyingfrom its upright position. When the counterstop 30 is positioned as atFigure 12, the line-end-defining position, the initial retraction of thecounterstop withdraws same from the margin stop, immediately followingwhich the counterstop assumes an upright position against the lug 11,under influence of spring 14. Further retraction ofthe counterstopcompletes the latching, as described. When latching is completed, as dois shown in Figure 1'1, the button 98 is released and the counterstop ispulled upwardly by its spring 14, carrying with it the latch I05. It maybe here noted that inretracting, the counterstop is lowered a distancetwice that necessary to clear the margin stop 25 and that the clearanceafforded by the slot I01 is equal to only half the retractive stroke ofthe counterstop. When the counterstop is raised after latching, the studI06 engages the upper end of the slot and thus gages 'the position ofthe counterstop so that its upper end is still below the path of thecarriage stop, having been raised only half its retractive stroke. Theupper end of the latch I05, however, is now projecting into the carriagestop path, see Figure 18. It will be noted that the spring 14 isrelatively stronger than spring I08 so as to overcome the tension of thelatter in raising the latch I05,

as described.

To complete the margin-release operation when the carriage is atline-end position, it is only necessary to press and release the button98, in

that the counterstop, having been in the Figure 12 position, is swung byits spring 14 to the opposite side of the margin stop. At thebeginningof-line position, Figure 13, it is necessary to hold the button98 down while the carriage is moved to its extreme rightward position,in order to get the margin stop at the opposite side of the counterstop.This mode of operation, however, is desirable in that the carriageshould be moved to its rightward limit before typing in the left-hand"margin.

To restore the carriage to within the linetyping zone, the carriage ismoved from either of the margin-typing positions and the stop 25 is thuscarried past the retracted counterstop 30. The margin stop thus engagesthe upper end of the latch I05, swinging same laterally on'its stud I06until the' catch H0 is freed from the bottom end of the latch,seeFigure's 19 and 20. The

counterstop 30 is thus released to be restored by its spring 14 to itsnormal, raised position in the path of the margin stops. When clear ofcatch IIO, the latch I05, under influence of its spring I00, is pulleddownwardly until the stud I06 bottoms in its slot, the spring I08 alsoacting to restore the latch to normal, upright position. The action ofthe mechanism in tripping the latch is substantially the same whetherrestoring the carriage'from the left or right margin-typing position.

- Tabulating tion at which a stop has been set for tabulating, bypressing a tabulator key II: which releasesthe carriage-for a tabulatingrun and raises the tabulator counterstop 3I to efiectiveposition in thepath of the carriage stops. As shown in Figure 1, the key H2 is carriedon a lever II3 pivoted at 43 and connected by a link II4 to an arm II5of a rockable member II6 rotatable on the shaft 36. A spring I I1 actingon the member II6 restores the mechanism to normal position at whichlever II3 engages the fixed member 46, see Figure 21. A second arm II8on the member II6 projects through an opening in the plate 38 andcarries a cam I20 cooperative with a bell Figures 6 and '7. A forkedportion of the bell crank cooperates with a roller I23 carried on thetabulator counterstop 3I and projecting through an elongate slot I24 inthe plate, which slot affords a guide for the counterstop and determinesits normal and projected positions. The counterstop is further guided inan up-and-down direction by a sliding contact edgewise with the stoprestorer 51, with which it is in coplanar relation. A spring I25restores the counterstop 3I and bell crank I2I to normal, inactiveposition.

The counterstop 3| includes a threaded ear I26 carrying a screw I21 fromwhich a rod I28 projects through an ear I30 of a brake plunger I3l. Aspring I32, backed by the screw I21, presses against the brake plungerear I30 forming a yieldable connection between the counterstop 3I andsaid plunger. A lever I33 pivoted at I34, has one end engageable by aforked portion of the plunger I3I and carries a brake shoe I35 adaptedto be brought into pressure engagement with a strap I36 secured to thestop rack bar 26, to retard carriage travel during the tabulating run.

In the present embodiment of the invention, the carriage is released fora tabulating run by withdrawing a holding dog of the letter-feedescapement. As shown best in Figures 3, 22' and 23, a finger I31projecting from the bell crank I2I is engageable with a lever I38pivoted at I39 on the plate 20 and has a finger I40 reaching through theplate and engageable with a holding dog I4I of the escapement,seeFigures run, the carriage is moving leftward,'- as indicated by thearrow, and the stop 2."! is, therefore, approaching the counterstop. Asthe carriage is released, the raising of the counterstop 3| actuates thebrake mechanism, in that the resultant compression of spring I32 pressesthe brake shoe i35'against the stop rack 26 to retard the momentum ofthe carriage. Upon release of the tabulator key H2, the counterstop 31is retracted by spring I25, thus releasing the brake mechanism and atthe same time restoring the carriage to the control of the letter-feedmechanism by releasing the holding dog MI. The

machine is thus conditioned for a succeeding tabulating operation, orfor further line typing, as required.

In banking the carriage at a selected column, the tabulator stop impartsa heavy impact to the counterstop 3| which, in projected position, isbacked by a member I 42 of the back plate. The portion of thecounterstop 3| with which the tabulator stops engage is necessarily of aminimum width to engage between two adjacent set stops. This engagingportion is, therefore, in the form of a thin projection I43 which, asshown in Figure 7, extends beyond the rear face of the counterstop andthus overlies the side of the plate member I42.

What is claimed is:

1. In a typewriter having a reciprocatory carriage movable inletter-space increments; a combined margin regulating and tabulatormechanism including a series of uniformly shaped, selectively settablestops on the carriage, arranged, slightly spaced in definite ratio tothe letterspace increments, substantially throughout the carriage run,for individual settings from anineffective position to a margin positionor a tabulating position, means to individually set said stops at astop-setting station, to either the margin or tabulating positions, anormally inefiective tabulator counterstop movable to a position toengage the tabulator set stops, a margin counterstop normally effectiveto engage the marginpositioned stops, and means, including the carriage,mounting said series of stops and said margin counterstop for limitedmovement together, after counterstop engagement by one of themargin-positioned stops, the extent of limited movement being such thatthe set margin stops are arrested substantially at said stop-settingstation, irrespective of the direction of carriage movement.

2. In a typewriter having a reciprocatory carriage movable inletter-feed increments; a combined margin-regulating and tabulatormechanism including a single series of stops on the carriage, said stopsbeing slightly spaced in definite ratio to the letter-feed incrementsand selectively settable to a margin-stop position or a tabulating-stopposition, means to individually set said stops to either the margin-stopor tabulating-stop positions in any letter-feed location of thecarriage, a tabulator-counterstop movable to a position to interceptstops set for tabulating, a margin-counterstop in the path of andbetween two stops set as margin-stops, and means aflfording to themargin-counterstop a characteristic of limited yield after engagement byone of the stops set at margin-stopping position to cause the carriageto conic to rest at the same location it assumed when the said one stopwas set at margin-stopping position.

3. In a typewriter having a reciprocatory, letter-feed-controlledcarriage, a combined margingaging and tabulator mechanism including asingle series of substantially identical letter-spaced stops on thecarriage, said stops being arranged for setting individually to amargin-gaging position or a tabulating-stop position. means toindividually set said stops to either of said positions selectively, ata predetermined station in the range of carriage travel, atabulator-counterstop movable into the path of the stops set totabulating-stop position to arrest the carriage by these set stopssuccessively substantially at said predetermined station, andmargin-counterstop means projecting into the path of and between twostops set to margin-gaging position, and arranged for movement in thedirections of carriage travel between limits, to arrest the carriage insuch manner that whichever of the two set stops is active inmargin-gaging will be presented at said station.

4. In a typewriter having a reciprocatory carriage movable inletter-space increments; a combined margin regulating and tabulatingmechanism including a series of uniformly shaped, selectively settablestops on the carriage, arranged, slightly spaced in definite ratio tothe letterspace increments, substantially throughout the carriage run,for individual settings from an ineffective position to a marginposition or a tabulating position, means to individually set said stopsat a stop-setting station, to either the margin or tabulating positions,a normally ineifective tabulator counterstop movable to a position toengage the tabulating-positioned stops, 3. margin counterstop normallyeffective to engage the margin-positioned stops, and means mounting saidmargin counterstop for movement in the direction of carriage travel,between limits defining right and left positions of the margincounterstop at each side of said stop-setting station, to arrest the setmargin-positioned stops substantially at said station, irrespective ofthe direction of carriage travel.

5. In a typewriter having a reciprocatory, letter-feed-controlledcarriage; a combined margin regulating and tabulator mechanism includinga series of uniformly shaped, selectively settable stops on thecarriage, arranged at letter-space intervals, substantially throughoutthe carriage run, for individual settings from an ineffective positionto a margin position or a tabulating position, mean to individually setsaid stops at a stop-setting station, to either the margin or tabulatingpositions, a normally ineffective tabulator counterstop movable to aposition to engage the tabulator-set stops, a margin counterstopnormally effective to engage the margin-positioned stops, and meansmounting said margin counterstop for movement in the direction ofcarriage travel, between limits positioning the counterstopapproximately one letter space distance from said stop-setting stationat either side thereof, to thereby arrest the margin-positioned stops atsaid station, irrespective of the direction of carriage movement.

6. In a typewriter having a reciprocatory, letter-feed-controlledcarriage; a combined margin-regulating and tabulating mechanismincluding a series of uniformly shaped, selectively settable stops onthe carriage, arranged at letter-space intervals substantiallythroughout the carriage run, for individual settings from an ineffectiveposition to a margin position or a tabulating position, a normallyretracted tabulator counterstop proiectible to a position to interceptthe tubular-set stops, to arrest the tabulating set stops at a givenpoint in travel of the carriage in a tabulating run, a margincounterstop in the path of and between two of the margin-set stops forgaging a normal line length of carriage travel, and means mounting saidmargin counterstop for shifting in the direction of carriage travelbetween limits at each side of said given point, the limits being soarranged that each of th two said margin-set stops is arrestedsubstantially at the said given point at which the tabulator-set stopsare arrested.

'7. In a typewriter having a reciprocatory, letter-feed-controlledcarriage; a combined margin regulating and tabulating mechanismincluding a series of uniformly shaped, selectively settable stops onthe carriage, arranged at letter-space intervals substantiallythroughout the carriage run, for individual settings from an ineffectiveposition to a margin position or a-tabulating-position, a normallyretracted tabulator counterstop projectible to a position to interceptthe tabulator-set stops, to arrest the tabulating set stops at a givenpoint in travel of the carriage in a tabulating run, a margincounterstop in the path of and between two of the'margin-set stops forgaging a line length of carriage travel, and means mounting said margincounterstop for shifting in the direction of carriage travel betweenlimits positioning said margin counterstop, upon interception of thesaid margin-set stops in carriage travel in either direction,approximately one letter space distance to each side of said given pointat which the tabulator-set stops ar arrested.

8. In a typewriter having a reciprocatory, letter-feed-controlledcarriage; a combined margin-regulating and tabulating mechanismincluding a series of uniformly shaped, selectively settable stops onthe carriage, arranged at letterspace intervals substantially throughoutthe carriage run, for individual settings from an ineffective positionto a margin posit'on or a tabulating position, a normally retractedtabulator counterstopprojectible to a position to intercept thetabulator-set stops, to arrest the tabulating set stops at a given pointin travel of the carriage in a tabulating run, a margin counterstop inthe path of and between two of the margin-set stops for gaging a linelength of carriage travel, means mounting said margin counterstop forshifting 5 in the direction of carriage travel between the limitsdefining a normal counterstop position approximately one letter space tothe right of said given point, and a shifted position approximately oneletter space to the left of said given point, and means yieldablyholding said margin counterstop in the normal rightward position.

9. In a margin-regulating and tabulating mechanism for a typewriterhaving a movable carriage; a series of letter-spaced stops slidable onthe carriage for selective setting progressively from an inefiectiveposition to a first projected position for tabulating and a secondprojected position for margin gaging, counterstop means therefor, and astop restorer shiftable to effective position in which the oppositesides of said restorer are engageable with the margin-set stops, saidrestorer having an inclined face adapted to cam all of the tabulator-setstops to ineffective position during a carriage run and having a rightangular end face adapted to engage any set stop individually in shiftingthe restorer, to restore the stop to ineffective position.

10. In a typewriter having a frame and a letter-feed-controlled carriagemovable thereon; a combined margin-regulating and tabulating mechanismincluding a series of letter-spaced stops slidable on the carriag forselectiv setting from an ineffective position to a margin position or atabulating position, a normally retracted tabulator counterstop slidableon the frame for projection into the path of the tabulating-set stops, astop restorer slidable on the frame substantially in coplanar relationwith said tabulator counterstop, said tabulator counterstop and saidrestorer having stop-engageable portions in close sidewise association,and a margin counterstop adjacent said stop restorer and said tabulatorcounterstop and slidable on said frame for retraction from normallyeffective position in the 45 path of the margin-set stops.

A. DOBSON.

CERTIFICATE OF CORRECTION. Patent No. 2,528,375. August 51, 1915.

WILLIAM A. DOBSON.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 6,second column, line 75, claim 6, for "tubular-set" read--tabulator-set--; page 7, second column, iine 5, claim 8, strike out"the" after "between"; and that the said Letters Patent should be readwith this correction therein that the same may conform to the record ofthe case in the Patent Office.

Signed and sealed this 1st day of August, A. D. 191m,

Leslie Frazer (Sea- 1) Acting Commissioner of Patents.

